unprecedent的用法和樣例：
例句
- Expenditure raced up to an unprecedented level.
開支劇增，達到空前的水平。 - Of course, it was an unprecedented mission.
當然有，這可是一項空前的任務呢。 - The enemy mad bombardment caused unprecedented death and destruction in the country.
敵人的狂轟濫炸在這個國家造成了空前的死亡和破壞。 - Expenditure raced up and up to an unprecedented level.
消費不斷地急劇上升，達到了空前的水準。
